Exploring Science: Elements and Reactions

What is the atomic number of oxygen?

• 8

• 12

• 10

• 6

Which element is represented by the symbol Na?

• Potassium

• Calcium

• Magnesium

• Sodium

What are the three main categories of elements in the periodic table?

• Metals, Nonmetals, Metalloids

• Halogens

• Transition Metals

• Noble Gases

What property distinguishes metals from non-metals?

• Metals are good conductors of electricity and heat, while non-metals are not.

• Metals are always solid at room temperature, while non-metals can be liquid or gas.

• Metals have lower melting points than non-metals.

• Non-metals are typically shiny and malleable, unlike metals.

Which metal is the most conductive of electricity?

• Silver

• Gold

• Copper

• Aluminum

What is the process of separating a solid from a liquid called?

• Filtration

• Evaporation

• Sedimentation

• Distillation

What technique would you use to separate a mixture of sand and salt?

• Using a magnet to attract the salt

• Heating the mixture to a high temperature

• Dissolving the mixture in water

• Filtration followed by evaporation.

What is the pH range of acids?

• -1 to 0

• 8 to 14

• 7 to 14

• 0 to 7

What is the chemical formula for hydrochloric acid?

• HCl

• HNO3

• NaCl

• H2SO4

What happens to the pH of a solution when a base is added?

• The pH of the solution decreases.

• The pH of the solution remains the same.

• The pH of the solution fluctuates randomly.

• The pH of the solution increases.